@sjb007 unfortunately I cannot reproduce the problem so I am unable to find a fix (tried even on Linux, without success [:(] )

In the meanwhile I have released the version 1.3 which adds the following capabilities:
- hides obstacles which obstructs the view, either automatically or using a polyline as threshold;
- pan vertically when the camera points towards the horizon.

Here is a video of the new features in action:
https://youtu.be/wYDrdH8brsw

@hashmex Thank you!